Oxy-fuel Apparatus – Part II

Posted by Florida Gas Welding

Torch HandleTorch Handle

A torch handle is essentially a set of gas tubes with control valves. One tube and valve controls the fuel supply and the other tube and valve controls the oxygen supply. The torch handle is not designed to mix the gases for oxy-fuel processes. The apparatus attached to the handle mixes the oxygen and fuel gases. The handle is a means of control for the gas supply.

VICTOR® torch handles consists of six basic elements, shown in Figure 4. The control valves with internal reverse flow check valves, the body “Y” with internal flashback arrestors, the barrel and tubes (located inside the barrel) and the torch head.

NOTE

VICTOR® torch handle model numbers that contain the letters “FC” are equipped with built-in flashback arrestors and check valves (i.e. 315FC). Model numbers with a “C” only contain built-in check valves (i.e. 315C). Earlier versions without an “F” or “C” in the model number contained neither (i.e. 315). For all “C” model torch handles and earlier versions, it is recommended that add-on flashback arrestors be installed. Most add-on flashback arrestors also contain built-in check valves.

Torch Handle Features

Figure 4: Torch Handle Features

Body “y” with Internal flashback arrestors

Most VICTOR® torch handles are equipped with built-in flashback arrestors. Flashback arrestors are designed to prevent mixed gases from igniting upstream of the flashback arrestors.

CAUTION

It is not recommended to use accessory flashback arrestors on VICTOR® FC torch handles since these devices are already built-in. Excessive flow restrictions may occur.

General Information on flashback arrestors

•The flashback arrestors contained in this torch are designed to prevent a flashback flame from entering the hose and gas supply system. A very fine “filter-like” sintered stainless steel flame barrier stops flashback flame.

•For maximum service life of the flashback arrestor, completely purge all lines and hoses before connecting to the torch. This removes loose material contained in the hose or regulator that could restrict flow through the flashback arrestor.

•Flow restriction and torch over-heating results if dirt or “oily” LPG residuals are allowed to flow into the flashback arrestor and cause clogging. Make sure not to draw liquid. Always store and use cylinders in the upright position.

Control Valves with Internal reverse flow Check Valves

The body “Y” has two control valves attached to it. The valve bodies are marked to distinguish between the two valves. The body of one valve has left-hand threads to accept the fuel gas hose. The other valve body has right-hand threads to accept the oxygen hose. The control valves never require lubricating. Occasionally, the packing nuts may require a slight adjustment.

Most VICTOR® torch handles are equipped with patented built-in reverse flow check valves to reduce the possibility of mixing gases in the hoses and regulators.

CAUTION

• Check valves are mechanical devices that can leak when dirty or if abused.

Check valves should be tested at least every six months, more often if hoses are frequently disconnected.

• Careless usage, dirt or abuse can shorten the service life of check valves, thus requiring more frequent testing.

• Follow the manufacture’s instructions for testing the check valves.

NOTE

Reverse flow check valves are not the same as flashback arrestors. Check valves are designed to help prevent reverse flow of gas upstream of the torch. Flashback arrestors are designed to prevent mixed gases from igniting upstream of the flashback arrestors.

Barrel

The barrel and inner oxygen tube unit is designed to keep the oxygen and fuel gases separated. A tube-within-a-tube design allows the oxygen supply to move through the inner tube to the head while the fuel supply travels through the interior barrel cavity.

Torch head

The torch head is threaded onto the barrel, creating a metal to metal seal; there are no O-rings. The oxygen supply from the inner tube is directed through the center hole in the head while the fuel supply passes through drilled orifices around the centered oxygen port. Tapered surfaces inside the head mate with O-rings when the cutting or welding attachment is connected. This creates a gas-tight seal. Never lubricate these surfaces. If damaged, the external threads and internal surfaces of the head may be reconditioned by a qualified repair technician.

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